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EMAT-VG System

 

System Features

The Electro-Magnetic Acoustic Transducer (EMAT) system is a computer controlled multi-system used to operate EMAT transducers for couplant-free transmitting and receiving of oblique incident bulk ultrasonic waves and guided waves in ferromagnetic materials using conventional ultrasonic instruments.

The system serves as signal-generating and processing (frequency filtering and gain control) component.  It provides time delayed RF signals for transmitter stages, amplification, filtering and summation of the received signals and power supply of the electromagnets of the transducers.

System control, such as frequency, pulse length (number of cycles), transducer selection, etc., is performed by the associated UT system.
System Characteristics 

   Base Unit

  • Synthesizer board

  • Burst generator board; burst length (number of cycles) and frequency are adjustable in the system settings

  • Single board with a maximum of eight transmitter power stages

  • Up to eight parallel transmitter/receiver channels with Phased Array capability

  • Receiver board with four selectable band filters and four amplifier stages

  • Control PC for system control and parameter settings via USB; settings data are saved to the EMAT-VG and the Control PC can be disconnected during data acquisition

Signals received from the receiver coils are pre-amplified in the transducer by built-in preamplifiers and transmitted to the system; there, the signals are further amplified and filtered by the filter stages.

       Technical Data

Frequency Range:
Burst Duration:
Pulse Repetition Rate:
Amplification:

50kHz - 10MHz
1 - 15 cycles, adjustable in steps of 1
400Hz, depending on transducer in use 
0dB, 13dB, 26dB and 40dB 

Computer Controlled Parameters and Functions 
  • Trigger Mode: internal, external, software triggered

  • Ultrasonic frequency

  • Number of cycles/bursts

  • Filter selection: 100kHz - 635kHz, 420kHz - 1070kHz,
                             750kHz - 1.92MHz and 1.5MHz - 5.15MHz

  • Receiver amplifier adjustments


Block Diagram
Block Diagram


Information Request Form EMAT-VG Technical Data

 
 

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Last modified: June 25, 2015